2019-12-13_REVISION - M1980244 (60)

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Spill .. and CountermeasuresNEWMONT •r the Cresson Project .• Relations 4.4 Crusher Facilities Locations for the primary and secondary crushers, crusher oil storage shed,and the crusher maintenance shed are shown on Figure 5.A variety of greases and oil are stored and used in the crushing facilities,as discussed in the following narrative. The Crusher Oil Storage Shed serves as the primary facility for storing greases and oils used at the crushers. It is a roofed building on a concrete slab with an overhead door for entry and exit. Drums and totes of various greases and oils are stored here on the concrete floor.See the inventory in Table 5 for a description of drums,totes,tanks, and secondary containment.Various drums and totes are also stored on grated steel pallets outside along the southeast wall of the Oil Storage Shed. Hydraulic oil,greases, and lubricants used for maintenance of the crushers are stored in 55-gallon drums,five- gallon buckets,tanks, and totes near the Primary and Secondary Crushers.A portable lubricating unit (approximately 67 gallon capacity)operates throughout the Secondary Crusher building, and a variety of greases and oils are stored in totes and drums on the ground floor. 4.4.1 Material Storage/Secondary Containment Almost 6,000 gallons of storage capacity exists in the Crusher Oil Storage Shed and the adjacent open containment area.The shed and the adjacent storage area both have secondary containment structures with respective volumes of 2,000 gallons(concrete floor of shed),and 270 gallons(grated pallets).Although the grated palettes would not contain the entire spill of one of the 500 gallon totes stored on top of it,the palette along with on-site BMP's would ensure a spill would not leave the area.The steel aerosol can puncturing device mounted on a 55- gallon drum at the Crusher Maintenance Shop is contained within a 95-gallon over-pack drum. Totes and drums, containing lubricants at the crusher buildings have no secondary containment other than the concrete slab floors of the buildings. Given the viscous nature of these lubricants,any spill would be contained within the building. 4.4.2 Potential Spill Scenarios, Volumes and Direction of Flow Most of the greases used for lubricating the mechanical devices within the crushing facilities are heavy,viscous, dense greases that are unlikely to spill. In the unlikely event of a grease tote or tank rupture the grease is so resistant to flow that it would not migrate more than several feet from the storage vessel.Therefore, significant spillage of greases is not expected to be a problem. Hydraulic oils used in the crushers are stored and used at locations that are underlain by a concrete slab,where spills can be observed during routine inspections and unit operation and properly cleaned-up.The most likely amount spilled would be on the order of<10 to 100 gallons. The overall spill potential from oil-filled electrical transformers is low.The units are new, modern installations, and are mounted on concrete slabs. 4.4.3 Discharge Prevention Extensive use of hydraulic oil occurs in the Crusher areas.The most important activity to prevent spills of hydraulic oil at the Crusher Facilities is operator care in the transfer of fluids, using common sense and diligence in making sure connections are secure, drip pans are in place, and containers are positioned to receive fluids properly. Runoff from areas surrounding the Crusher Facilities flows to holding ponds where any oil spilled can be skimmed prior to release. Even though catchment of runoff is provided,special care will be exercised to prevent hydraulic oils from migrating to areas outside the crushers. Used oil generated at the Crushers are temporarily stored in drums or totes,and then hauled to the Ironclad Facilities for use as heating fuel or for shipment to an off-site disposal/recycling facility. Used greases stored in drums are hauled to the Ironclad Facilities for shipping to an off-site disposal facility. ---- -------- -------- ---- --- - ------------ ---------------------------- ------ - - - Department THIS DOCUMENT IS UNCONTROLLED IN HARDCOPY FORMAT � Doc Id:NA-CCV-SER-PLAN- 1930